technical data KK494 pwm control circuit the kKK494 incorporates on a single m onolithic chip all the functions requi red i n t h e const r uct i on of a pul se-wi d t h -m odul at i on cont rol ci rcui t . desi gned pri m ari l y for power suppl y cont rol , t h e kk 494 contains an on- ch ip 5 - v o lt reg u l ato r , two erro r am p lifiers, ad j u stab le o s cillato r, d ead - t i m e cont rol com p arat or, pul se-st eeri ng fl i p -fl op, and out put -cont rol circu itry. th e u n c o m m itted o u t p u t tran sisto r s p r o v i d e eith er co m m o n - em itter or em itter-follower output capab ility. push-pull or single-ended out put operat i on m a y be sel ect ed t h rough t h e out put -cont rol funct i on. the architecture of the KK494 prohibits th e possibility of either output being pul sed t w i ce duri ng push-pul l operat i on. ordering information kk 494n plastic kk 494d soic t a = -20 c to 8 5 c for all packages ? co m p lete pw m po wer co n t ro l circu itry ? uncom m itted outputs for 200 m a sink or source ? out put c ont rol sel ect s si ngl e-ended or push-pul l operat i on ? int e rnal c i rcui t r y prohi bi t s doubl e pul s e at ei t h er out put ? int e rnal r e gul at or provi des a st abl e 5 v r e ference suppl y ? vari abl e dead-ti m e provi des c ont rol over tot a l r a nge pin assignment function table output control output function grounded si ngl e-ended or paral l e l out put at v ref norm al push-pull operation logic diagram 1
KK494 maximum ratings s y m b o l p a r a m e t e r v a l u e u n i t v cc suppl y vol t a ge 41 v v i am pl i f i e r input vol t a ge v cc +0.3 v v o c o l l ect or out put vol t a ge 41 v c o l l ect or out put c u rrent 250 m a tst g st orage tem p erat ure -65 t o +150 c recommended operating conditions s y m b o l p a r a m e t e r m i n m a x u n i t v cc suppl y vol t a g e 7 4 0 v v i am pl i f i e r input vol t a ge -0.3 v cc - 2 v v o c o l l ect or out put vol t a ge 40 v c o l l ect or out put c u rrent (each transi st or) 200 m a current into feed back term inal 0.3 m a c t ti m i ng c a paci t o r 0.47 10.000 nf r t ti m i ng r e si st or 1.8 500 k ? o s c i l l a t o r f r e q u e n c y 1 3 0 0 k h z t a operating free-air tem p erature -20 +85 c 2
electrical characteristics (tem perature -20 85 c, v cc = 15 v, f=10 khz)) s y m b o l p a r a m e t e r test c o n d i t i o n s m i n m a x unit reference section v ref out put vol t a ge i o =1 m a 4.75 5.25 v v regin out put regul at i on v cc =7 v to 40 v, t a =25 c 2 5 m v v regout input regul at i on i o =1 to 10 m a , t a =25 c 1 5 m v ? v ref out put vol t a ge change wi t h tem p erature t a = -20 c to 8 5 c 1 % i sc short - ci rcui t out put current (not e 1) v r e f = 0 5 0 m a oscilla to r sectio n f osc frequency c t =0.01 f, r t =12 k ? 6 1 4 khz f osc st andard devi at i on of frequency (not e 2) all v a lu es o f v cc , c t , r t , t a c onst a nt 1 5 % f osc( ? v) frequency change wi t h vol t a ge v cc = 7 v t o 40 v, t a =25 c 1 0 % f osc( ? t) frequency change wi t h tem p erature c t =0.01 f, r t =12 k ? t a = -20 c to 8 5 c 2 % dead time control section i ib(2t) input bi as current (pi n 4) v i = 0 t o 5.25 v -10 a dc ma x maxim u m duty cycle, each out put v i(pin 4) =0 v 45 % v thd input t h reshol d vol t a ge zero dut y cy cl e 3.3 v (pi n 4) m a xi m u m dut y cy cl e 0 error amp section v io input offset vol t a ge v o(pin 3) =2.5 v 10 m v i io input offset current v o(pin 3) =2.5 v 250 na i ib input bi as current v o(pin 3) =2.5 v 1 a c o m m on-m o d e i nput v cc = 7 v to 40 v low -0.3 v v o l t a g e r a n g e h i g h v cc - 2 a vol open-l oop vol t a ge am p lificatio n ? v o =3 v, v o =0.5 to 3.5 v 7 0 db f b uni t y -gai n bandwi d t h 100 khz c m r r c o m m on-m ode reject i o n ratio v cc =40 v, t a =25 c 6 5 db i o out put si nk current (pi n 3) v id =-15 m v t o -5 v, v o(pin 3) =0.7 v 0 . 3 m a i o+ out put source current (pin 3) v id =15 m v t o 5 v, v o(pin 3) =3.5 v - 2 m a 3 KK494
electrical characteristics (tem perature -20 85 c, v cc = 15 v, f=10 khz)) s y m b o l p a r a m e t e r test c o n d i t i o n s m i n m a x unit pwm comparator secti o n v thp input t h reshol d vol t a ge (pin 3) zero dut y cy cl e 4.5 v i i input si nk current (pi n 3) v o(pin 3) =0.7 v 0.3 m a sw i t chi n g characteri sti c s t rc output voltage rise tim e com m on-em itter configuration 200 ns t fc output voltage fall tim e com m on- em itter configuration 100 ns t rf output voltage rise tim e em itte r-follower configuration 200 ns t ff output voltage fall tim e em itter-fo llower configuration 100 ns output section i c ( o ff) collector off-state current v ce =40 v, v cc =40 v 100 a i e(of f ) em itter off-state current v cc =v c =40 v, v e = 0 - 1 0 0 a v sat collector- em itter c o m m on- em itter v e =0, i c =200 m a 1.3 v s a t u ratio n vol t a ge em itter- follower v c =15 v, i e =-200 m a 2.5 i och out put cont rol i nput current v i =v ref 3 . 5 m a total device i cc st andby suppl y current al l ot her i nput s & v cc =15 v 10 m a out put s o p e n v cc =40 v 15 i cca average suppl y current v (pin 4) =2 v 17 m a notes: 1. duration of the short circ uit should not exceed one second. 2. st andard devi at i on i s a m easure of t h e st at i s t i cal di sri but i on about t h e m ean as deri ved from t h e form ul a n (x n - x) 2 n=1 = n ? 1 4 KK494
n s u f f i x p l as t i c di p (m s - 0 0 1 b b ) sy m b o l m i n m a x a 18. 67 19. 69 b 6. 1 7 . 1 1 c 5. 33 d 0. 36 0. 56 f 1. 14 1. 78 g h j 0 10 k 2. 92 3. 81 no t e s : l 7. 62 8. 26 1. d i m e n s i o n s ?a ?, ?b ? d o n o t i n cl u d e m o l d f l as h o r p r o t r u s i o n s . m 0. 2 0 . 3 6 m a x i m u m m o l d f l a s h o r p r o t r u s i o n s 0. 25 m m ( 0 . 010) p e r s i d e . n 0. 38 d su f f i x so i c (m s - 0 1 2 a c) sy m b o l m i n m a x a 9. 8 1 0 b 3. 8 4 c 1. 35 1. 75 d 0. 33 0. 51 f 0. 4 1 . 2 7 g h j 0 8 no t e s : k 0. 1 0 . 2 5 1. d i m e n s i o ns a a n d b d o no t i n c l ud e m o l d f l a s h o r p r ot r u s i on . m 0. 19 0. 25 2. m a x i m u m m o l d f l a s h o r p r o t r u s i o n 0. 15 m m ( 0 . 006) p e r s i d e p 5. 8 6 . 2 fo r a ; fo r b ? 0. 25 m m ( 0 . 010) p e r s i d e . r 0. 25 0. 5 5. 72 2. 54 7. 62 1. 27 d i me n s i o n , mm d i me n s i o n , mm a b h c k c m j f m p g d r x 4 5 se a t i n g pl an e 0 . 25 ( 0 . 010 ) m t -t - 1 16 8 9 l h m j a b f g d se a t i n g pl a n e n k 0. 2 5 ( 0 . 010) m t -t - c 1 16 8 9 5 KK494
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